Pantograph



R. C. EMMERLING.

PANTOGRAPH.

APPLICATION FILED 020.24. 1919.

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PANTOGRAJEH.

Specification of Letters Patent.

I Patented July 5, 1921.

Application filed December 24, 1919. Serial N 0. 347,095.

T 0 all whom it may concern: I

, Be it known that I, RUDOLPH C. EMMER- LING, a citizen of'the United States, and a resident of the city of West Hoboken, in the county of Hudson and State of New Jersey, have invented a new and useful Pantograph, of which the following is a full, clear, and exact description.

Commercial pantographs heretofore placed upon the market for drafting, engraving, enlarging and reducing purposes have left much to be desired in that their construction has, for the most part, been extremely complicated, and, these devices, after some little use, have resulted in having a slight amount of play at their points of connection which has quite often resulted in the jamming of the various parts with respect to one another, eliminating the device from further usefulness.

With the great amount of complication in structure previously referred to in devices of this nature further diflioulty has been experienced that pantographs, as a whole, have been out of reach of the laymen in view of their retail cost.

Now as an object of my invention I have constructed a pantograph which shall be so simple as to be within reach of everybody, which shall lend itself to any number of uses, such as engraving, drafting and manifold other uses for the purpose of enlarging or reducing.

Reference is had to the accompanying sheet of drawings which illustrate one practical embodiment of my invention, in which drawings:

Figure l is a plan view of one form of pantograph constructed in accordance with my invention;

Fig. 2 is an enlarged sectional view taken along lines 2f2 of Fig. 1;

Fig. 3 is a sectional view taken along lines 3-3 of Fig. 1, and,

Figs. 4 and 5 are plan views of slightly modified forms of pantograph.

In all of these views like reference numerals designate similar parts, and the reference numeral 1 indicates a block in which the work to be operated upon may be held, assuming that it is desired to reduce the engravin or stenciling from a standard pattern. iivotally secured adjacent the ends of the block and to the block are links 2 forming two sides of a panto ra h the o osite sides of which include fliither li lzs 3, formed with extensions 4, projecting beyond the points of pivotal engagement with the l nks 2. The extensions 4 of the rearmost links 3 are secured to an immovable member, such as 5, which may form part of the table. The extensions 4 of the outermost links 3 are pivotally secured together at6, as has been clearly shown in Fig. 1.

A third parallelogram including four pivotally interconnected links, is associated with the afore described structure, and has two of such links extending beyond the point of pivotal connection, as has been indicated by the reference numeral 10, the outer end of one of these portions being superimposed upon the pivotal point of the inner-end of one of the extensions 4 of the links 3 upon the member 5, the opposite extension 10 having incorporated with it a tracer point 11; 7

It is now to be understood that the piece to be worked upon is conveniently associated with a block 1 by means of the clamps forming a part thereof, and thetracer point 11 may be brought to pass over the lines of a pattern. Also, a tracer point might be conveniently associated with the block 1 so as to cause a tracing upon a sheet of removable material, rather than moving the piece to be worked upon fixed within the block 1, and having, as has been indicated by Fig. 3, a stationary tracer'point above the same.

Now upon movement being imparted to the tracer point 11 the block 1 will perform movement in the same direction, the proportion of such movement with respect to the point 11 being as 1:4. Should it now be desired to have merely a reduction of work, as 1:2, the block 1 may be conveniently-assooiated with'my appliance at the pivotal point 6 of the extensions 40f the outer links 3, as has been indicated in dotted lines by the reference numeral 12, which will produce the result desired.

On the other hand, should it be desired to enlarge the work from a small pattern, the tracer point 11 might be conveniently substitued for the block 1, and the block 1 as has been indicated by dotted lines at 13, placed on the extension 10, which will cause an enlargement of the work in the proportion of 1 :3.

Qbviously any convenient structure may be resorted to for interconnecting the links, and any provision for tracing or holding the piecedto be worked upon may also be effecte graph illustrated in Fig. .1,it will be readily.

appreciated that this form of device lends be associated with the same,-either for. re

ducing or enlarging.

I 1 Inithis :connectionattention is invited to I parallelograins 14,

15, '16 and 1 17, provided with extensions, ashas been indicated at 18 and 19. The extensions 18 are pivotally associated, as ha'sbeenshow nat 20, with some fixed member, such as a tablG. 1

? Forming a pivotal connection, and extending between the extension 19 in a bar, such as 21, which is convenientlyassociated with a tracer point 22, are work holding bars 28. A second bar 24 extends between and is pivota'lly secured to the point' of connection of the links, not provided with'the extensions, forming apart ofpantographs 1 1, 15, 16and bar 24 mayj'be work holding blocks 25,: or

tracer points 26 for use in engraving and tracing work respectively, asfw'ell as'for enlarging purposes, in which instance the tracer point 22 is associated with the bar 21. r

v seen that In the last described construction it will" readily be understood that upon a movement being imparted to the tracer point 22, the bar 24: will make a corresponding movement as 1:2, andthat the elements associated with these bars may readily be'transposed, so that this form 'ofpantographmay; serve for both reducing and enlarging purposes, as well as to "be adaptedto various forms of work.

' Referring now finally to Fig. 5 it will be this figure includes simply the structure illustrated in Fig. 4 with the exception that onlyhalf of the pantograph illus trated inFi 4; is; utilized. This form of pantograph is particularly desirable where economy is the aim, and will very well serve the purpose for both enlarging and reducing work, the tracer," point where work is to be reduced, being associated with; this device, as indicated at'25. v.

Obviously-numerous modifications might be resorted to {without in the least departing vp ng a r nected at one end to the free end of one of itselr' readily toany desired application, and, an'y'number of pieces to be'worked upon may from the scope ofymyinvention, which claim as: s Q 1. A device of thecharacter stated comport, a pair of links, each link pivotally conthe leversand the other ends of saidflinks being piv otally connected together, plurality of-work holding arms pivotally connected at one end to a piece of work and at their other ends to the-intermediate portions V fixed support,.a pair oflevers pivot- "'ally' connectedto opposite endsof the supofthe links and levers, atraci'ng pointyan arm carrying said tracing point, and means connecting said arm with the support and with the pivotal the work is caused to move in thedirection in which the tracing point is moved" 2. A device of the character st ted-including a fixed support, a pair of arms *pivotally connected at different points 'tothe support, I r

a pairof links pivotally connected at one end to the free ends of the leversand at their" other end to each-other, an arm, a-tracing point carried by the free end ofthe arm,ralever pivotally conne'cted atone end to-the arm and at its other end t'ovthe support, de vices connecting" the-intermediate portions of the'last mentioned lever and the point carrying arm with the links at their point" of pivotal connection, connected with-the, intermediate portions of the links and the first mentioned levers for supporting a piece of work, and moving the work in the direction in'which the tracing point is moved.-

3. A device of the character stated includ 2 ing a stationary support, a pair of levers each having one of its endspivotally connected to the stationary support and said ends being point'of the'linkswhereby 2 and means: operatively spaced apart, a pair of links,-;each link pivot-r allyconnect'ed at one endto the freeend of one of the levers,'*said links-'being 'pivotally V connected together 1 at their other ends, "a movable member, a plurality of arms pivotmovable member is positivelymoved in the direction in whiclithe tracingfpoint is. moved.

' RUDOLPH CHRlS'l'O lHllR-i EMMERLING.

.ally'connected at one end to the movable s a V 

